Python 字符串格式化使用 “字符 %格式1 %格式2 字符”%(变量1,变量2),%格式表示接受变量的类型。
CONTENTS
常用格式
格式符号 表示类型 %s 字符串 %d/%i 十进制整数 %u 十进制整数 %o 八进制整数 %x/%X 十六进制整数 %e/%E 科学计数 %f/%F 浮点数 %% 输出%
以下转自【 http://www.pythonclub.org/python-basic/print 】,有删改。
直接输出字符串
strHello = 'Hello Python' print strHello #输出结果:Hello Python
格式化输出整数
strHello = "the length of (%s) is %d" %('Hello World',len('Hello World')) print strHello #输出结果:the length of (Hello World) is 11
格式化输出16制整数
nHex = 0x20 #%x --- hex 十六进制 #%d --- dec 十进制 #%d --- oct 八进制 print "nHex = %x,nDec = %d,nOct = %o" %(nHex,nHex,nHex) #输出结果:nHex = 20,nDec = 32,nOct = 40 #使用整数的各个制打印同一个数
格式化输出浮点数(float)
import math #default print "PI = %f" % math.pi #width = 10,precise = 3,align = left print "PI = %10.3f" % math.pi #width = 10,precise = 3,align = rigth print "PI = %-10.3f" % math.pi #前面填充字符 print "PI = %06d" % int(math.pi) #输出结果 #PI = 3.141593 #PI = 3.142 #PI = 3.142 #PI = 000003
格式化输出字符串(string)
#precise = 3 print "%.3s " % ("jcodeer") #precise = 4 print "%.*s" % (4,"jcodeer") #width = 10,precise = 3 print "%10.3s" % ("jcodeer") #输出结果: #jco #jcod # jco
输出列表(list)
l = [1,2,3,4,'jcodeer'] print l #输出结果:[1, 2, 3, 4, 'jcodeer'] #list直接打印即可
输出字典(dictionary)
d = {1:'A',2:'B',3:'C',4:'D'} print d #输出结果:{1: 'A', 2: 'B', 3: 'C', 4: 'D'}
python print自动换行
print 会自动在行末加上回车,如果不需回车,只需在print语句的结尾添加一个逗号”,“,就可以改变它的行为。
for i in range(0,5): print i, 或直接使用下面的函数进行输出: sys.stdout.write("输出的字串")
万能的 %r
%r是一个万能的格式符,它会将后面给的参数原样打印出来,带有类型信息。 python print %r 案例 formatter = "%r %r %r %r" print formatter % (1, 2, 3, 4) print formatter % ("one", "two", "three", "four") print formatter % (True, False, False, True) print formatter % (formatter, formatter, formatter, formatter) print formatter % ( "I had this thing.", "That you could type up right.", "But it didn't sing.", "So I said goodnight." ) 输出结果: $ python ex8.py 1 2 3 4 'one' 'two' 'three' 'four' True False False True '%r %r %r %r' '%r %r %r %r' '%r %r %r %r' '%r %r %r %r' 'I had this thing.' 'That you could type up right.' "But it didn't sing." 'So I said goodnight.' $
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